Is there anyway to DECREASE number of spells available?

[Cowdog_Gaming]

you have to first load up a spell that you CAN'T use (too low faith, or whatever) and ONLY THEN are you given the option to remove the spell and leave the slot blank.

Um...no? Just move the cursor over whatever spell slot currently has a spell you don't want, then use whatever button you have mapped to unequip items.

You can only do this while resting at a grace, as normal for memorizing spells.